Efficient transformation and elimination of roxarsone and its metabolites by a new α-FeOOH@GCA activating persulfate system under UV irradiation with subsequent As(V) recovery

被引:99
作者
Su, Shanshan [1 ,2 ]
Cao, Chengjin [1 ,2 ]
Zhao, Yaping [1 ,2 ]
Dionysiou, Dionysios D. [3 ]
机构
[1] East China Normal Univ, Shanghai Key Lab Urban Ecol Proc & Ecorestorat, Sch Ecol & Environm Sci, Shanghai 200062, Peoples R China
[2] Inst Ecochongming, Shanghai 200062, Peoples R China
[3] Univ Cincinnati, Dept Chem & Environm Engn ChEE, Environm Engn & Sci Program, Cincinnati, OH 45221 USA
基金
中国国家自然科学基金;
关键词
Goethite nanocomposite; Roxarsone; Persulfate activation; In-situ degradation -adsorption; As(V) recovery; CARBON NANOTUBES AEROGEL; FENTON-LIKE PROCESS; P-ARSANILIC ACID; GRAPHENE OXIDE; PHOTOCATALYTIC DEGRADATION; HETEROGENEOUS CATALYST; OXIDATIVE-DEGRADATION; ORGANIC POLLUTANTS; AQUEOUS-SOLUTION; POULTRY LITTER;
D O I
10.1016/j.apcatb.2018.12.050
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Roxarsone (ROX) is extensively used as a feed additive which tends to leave toxic inorganic arsenic (As) in the natural environment. A composite of reduced graphene oxide and carbon nanotubes was impregnated with goethite designated as a-FeOOH@GCA and tested as an integrated catalyst and adsorbent for ROX decontamination. Nearly 100% of the ROX was transformed in a-FeOOH@GCA activating persulfate (PS) under UV36s irradiation system at relatively low dosage of the a-Fe0OH@GCA catalyst (250 mg L-1) in 120 min. The As(V) released in the ROX oxidation was simultaneously adsorbed onto the surface of the a-FeOOH@GCA. A possible ROX transformation pathway is proposed. The As(V) adsorbed on catalyst was recovered and used to form an efficient Ag3Asa4 photocatalyst. This work further extends the oxidation-adsorption technology in solving organoarsenical contamination without producing secondary pollution.
引用
收藏
页码:207 / 219
页数:13
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